Friday

October 21, 2016
Posted by **lindsay** on Saturday, May 18, 2013 at 7:41pm.

- math -
**Henry**, Sunday, May 19, 2013 at 8:38pm8cos^2X - 2 = 0

8cos^2x = 2

cos^2x = 2/8 = 0.25

cosx = sqrt(0.25) = 0.5

Xr = 60o = Reference angle.

X-Xr = 180

x-60 = 180

X = 180+60 = 240o.